Here are some photos of my Twinstar D-18 mod / bash. It flies well with Magnum .52 4c engines and 10 - 8 props. It is on the heavy side but it is ultra stable in the wind. The Magnums sip fuel so a 10 to 12 minute flight is typical. I need just a few clicks on the throttle to bring it in for a smooth landing.
I found a site that has a Beechcraft 18 in the size range I'm looking for. It is electric but I think I can modify it for nitro engines. If all goes well I'll end up going with a larger kit.
http://www.kamodels.com/
Ross 3951